Breaker Failure Protection Ccrbrf(50Bf); Identification; Application; Setting Guidelines - ABB Relion 670 Series Applications Manual

1MRK 511 358-UUS A
Warning : If the calculated time to trip factor is below the setting Warning a warning signal is
activated. The setting is given in minutes.
7.9

Breaker failure protection CCRBRF(50BF)

7.9.1

Identification

Function description
Breaker failure protection, 3-phase
activation and output
7.9.2

Application

In the design of the fault clearance system the N-1 criterion is often used. This means that a fault
needs to be cleared even if any component in the fault clearance system is faulty. One necessary
component in the fault clearance system is the circuit breaker. It is from practical and economical
reason not feasible to duplicate the circuit breaker for the protected component. Instead a
breaker failure protection is used.
Breaker failure protection, 3-phase activation and output (CCRBRF, 50BF) will issue a back-up trip
command to adjacent circuit breakers in case of failure to trip of the "normal" circuit breaker for
the protected component. The detection of failure to break the current through the breaker is
made by means of current measurement or as detection of remaining trip signal (unconditional).
CCRBRF (50BF) can also give a re-trip. This means that a second trip signal is sent to the protected
circuit breaker. The re-trip function can be used to increase the probability of operation of the
breaker, or it can be used to avoid back-up trip of many breakers in case of mistakes during relay
maintenance and test.
7.9.3

Setting guidelines

The parameters for Breaker failure protection 3-phase activation and output CCRBRF (50BF) are
set via the local HMI or PCM600.
The following settings can be done for the breaker failure protection.
GlobalBaseSel : Selects the global base value group used by the function to define ( IBase ), ( VBase )
SBase ).
and (
Operation : Disabled / Enabled
FunctionMode This parameter can be set Current or Contact . This states the way the detection of
failure of the breaker is performed. In the mode current the current measurement is used for the
detection. In the mode
failure of the breaker. The mode
Application manual
IEC 61850
identification
CCRBRF
Contact the long duration of breaker position signal is used as indicator of
Current&Contact means that both ways of detections are
IEC 60617 ANSI/IEEE C37.2
identification device number
50BF
3I>BF
SYMBOL-U V1 EN-US
Section 7
Current protection
IP14514-1 v6
M14878-1 v5
M13916-3 v6
M11546-4 v8.1.1
169